CN104214165A - Double-port supporting locking oil cylinder and control method of double-port supporting locking oil cylinder - Google Patents
Double-port supporting locking oil cylinder and control method of double-port supporting locking oil cylinder Download PDFInfo
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- CN104214165A CN104214165A CN201410172859.0A CN201410172859A CN104214165A CN 104214165 A CN104214165 A CN 104214165A CN 201410172859 A CN201410172859 A CN 201410172859A CN 104214165 A CN104214165 A CN 104214165A
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- cylinder
- oil cylinder
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Abstract
The invention relates to a double-port supporting locking oil cylinder, which comprises a cylinder tube, an upper end cover, a lower end cover and a guide sleeve, wherein the upper end cylinder, the lower end cylinder and the guide sleeve are fixedly arranged on the cylinder tube, the upper end cover, the lower end cover, the guide sleeve and the cylinder tube form an accommodating cavity, a piston rod assembly is arranged in the accommodating cavity, a piston and a locking sleeve sheath the piston rod assembly from top to bottom, the locking sleeve and the cylinder tube are in interference fit, the upper end of the cylinder tube is provided with an upper oil nozzle used for controlling the action of the oil cylinder, and the lower end of the cylinder tube is provided with a lower oil nozzle used for controlling the action of the oil cylinder and unlocking the oil cylinder. The invention also relates to a control method of the double-port supporting locking oil cylinder. The double-port supporting locking oil cylinder has the advantages that an oil path is simplified, the cost is reduced, the reliability and the effective stroke are improved, in addition, the work state of the cylinder tube is better during the unlocking, and abrasion and groove forming cannot easily occur, so that the application is more convenient and reliable.
Description
Technical field
The present invention relates to a kind of dual-port support lock locking oil cylinder and controlling method thereof.
Background technique
Many engineer applied occasions need that volume is little, thrust is large and can the actuation element of precision positioning, and the hydraulic jack (oil hydraulic cylinder) with arbitrary position locking function is a well selection, so it is widely used in support and the locking of automobile, trailer, trailer and other moving carrier.
The hydraulic jack with above-mentioned functions is divided into steel ball type self-locking oil cylinder and interference type locking cylinder by locking principle.Steel ball type self-locking oil cylinder relies on the friction self-locking between steel ball and cylinder barrel be arranged in piston on inclined-plane to make plunger lock, this oil cylinder has two actuator ports, do not need special unblock hydraulic fluid port, working method is identical with common oil cylinder, hydraulic circuit is also identical with common oil cylinder, use more for convenience, but this cylinder tube inwall is easily out of shape, coupling mechanism force is restricted, and is of limited application.The frictional force that interference type locking cylinder relies on the interference fit between piston and cylinder barrel or between piston rod and cylinder body to produce makes piston or piston rod lock, see Fig. 1, this oil cylinder locking power is large, but need configuration three hydraulic fluid ports to work, one of them hydraulic fluid port is specifically designed to unblock, two other hydraulic fluid port is used for action control, unlocks with action control separate.
Interference type locking cylinder is as the surrounding being generally installed on large vehicle during support cylinder, and distant with hydraulic power, therefore connecting pipeline is longer, and supporting point position needs activity, need configure flexible pipe.So three hydraulic fluid ports of support cylinder all need to be connected to hydraulic power from hydraulic power through multistage hard tube and flexible pipe.The complexity of connecting pipeline makes hydraulic system link increase, and the node that oil leakage fault occurs increases, and system reliability reduces, and the bottom etc. being usually installed on vehicle due to pipeline is difficult to the position of keeping in repair, once there is the problems such as leakage of oil to be difficult to process.
Summary of the invention
Goal of the invention: the object of the invention is to overcome deficiency of the prior art, provides a kind of convenient and reliable dual-port support lock locking oil cylinder and controlling method thereof.
Technological scheme: a kind of dual-port support lock of the present invention locking oil cylinder, comprise cylinder barrel and be fixed on upper end cap, lower end cap and the guide sleeve on cylinder barrel, described upper end cap, lower end cap, guide sleeve and cylinder barrel form a cavity volume, a piston rod assembly is provided with in cavity volume, piston rod assembly is arranged with a piston and a lock sleeve from top to bottom, lock sleeve and cylinder barrel interference fit, described cylinder barrel upper end is provided with the upper oil nozzle of a control cylinder action, and cylinder barrel lower end is provided with a control cylinder action and unlocks the lower oil nozzle of oil cylinder.
Preferably, also comprise locking nut, seal ring, described piston is connected on piston rod assembly by locking nut, and piston inner periphery and the outer periphery are respectively equipped with seal ring and cavity volume is isolated into rod chamber and rodless cavity; Described lock sleeve periphery is provided with the spiral chute be communicated with rod chamber.
Preferably, described piston rod assembly is up-thin-low-thick hollow stepped cylindrical body, the sheathed piston of the part that in piston rod assembly, diameter is less, and the part that diameter is larger forms moving piston bar.
Preferably, described moving piston bar external diameter and internal diameter of cylinder meet relation π (R
2-r
2) < 0.2 × π R
2, wherein R is internal diameter of cylinder, and r is moving piston bar external diameter.
Preferably, described moving piston bar external diameter and internal diameter of cylinder meet relation
0.1 × π R
2< π (R
2-r
2) < 0.2 × π R
2, wherein R is internal diameter of cylinder, and r is moving piston bar external diameter.
The invention also discloses a kind of dual-port support lock locking oil cylinder controlling method, the hydraulic system comprising above-mentioned dual-port support lock locking oil cylinder and be communicated with described cavity volume, when described dual-port support lock locking oil cylinder needs to unlock, the high pressure oil of described hydraulic system enters cavity volume from lower oil nozzle, and high pressure oil is by cylinder barrel and the interference fit part of lock sleeve and the bottom spreading of cylinder barrel.
Preferably, the motion of described dual-port support lock locking oil cylinder is by two-way Oil-source control.
Preferably, described hydraulic system comprises high pressure oil pump and low pressure fuel pump, described high pressure oil pump under the control of the one or two solenoid directional control valve and the first relief valve, provide high pressure oil and under injecting oil nozzle to realize the unblock of dual-port support lock locking oil cylinder; Described low pressure fuel pump provides low pressure oil and injects oil nozzle under the control of the two or two solenoid directional control valve and the second relief valve, described dual-port support lock locking oil cylinder stretches out when three-position electromagnetic selector valve is in left position, regain when three-position electromagnetic selector valve is in right position, and regain speed by throttle valve adjustment, the stop motion when three-position electromagnetic selector valve is in meta.
Beneficial effect: the function of old unblock hydraulic fluid port merges in motion control hydraulic fluid port by dual-port support lock locking oil cylinder of the present invention, thus only needs two oil nozzles, simplifies oil circuit, reduces cost, improve reliability; Simultaneously because unlock high pressure oil to enter rod chamber from lower oil nozzle, so only need a upper piston, enormously simplify internal structure, add effective travel.Dual-port support lock locking oil cylinder of the present invention is when unlocking, not only by cylinder barrel and lock sleeve interference fit part spreading, and by the rod chamber part also spreading of cylinder barrel, when making to unlock, the working state of cylinder barrel is better, abrasion, La Gou are less likely to occur, apply reliably convenient.
Accompanying drawing explanation
Fig. 1 is existing locking cylinder schematic diagram, and c is for unlocking hydraulic fluid port;
Fig. 2 is dual-port support lock locking oil cylinder schematic diagram of the present invention;
Fig. 3 is oil cylinder control principle drawing of the present invention;
Fig. 4 is oil cylinder cylinder barrel spreading contrast schematic diagram when stretching out, and d1 is the spreading situation of existing oil cylinder cylinder barrel when stretching out, and d2 is the spreading situation of oil cylinder of the present invention cylinder barrel when stretching out.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
See Fig. 2, a kind of dual-port support lock locking oil cylinder, comprises pressing plate 1, card key 2, cylinder barrel 3, upper end cap 4, upper oil nozzle 5, locking nut 6, piston 7, lock sleeve 8, piston rod assembly 9, lower oil nozzle 10, guide sleeve 11, flange 12, lower end cap 13, bulb 14; Described upper end cap 4, lower end cap 13, guide sleeve 11 and cylinder barrel 3 form a cavity volume, a piston rod assembly 9 is provided with in cavity volume, piston rod assembly 9 is arranged with piston 7 and a lock sleeve 8 from top to bottom, lock sleeve 8 and cylinder barrel 3 interference fit, ensure the reliable locking of oil cylinder, described cylinder barrel 3 upper end is provided with the upper oil nozzle 5 of a control cylinder action, and cylinder barrel 3 lower end is provided with a control cylinder action and unlocks the lower oil nozzle 10 of oil cylinder.
Described piston 7 is connected on piston rod assembly 9 by locking nut 6, and piston 7 inner periphery and the outer periphery are respectively equipped with seal ring and cavity volume is isolated into rod chamber a and rodless cavity; Described lock sleeve 8 periphery is provided with the spiral chute b be communicated with rod chamber a.
Described piston rod assembly 9 is up-thin-low-thick hollow stepped cylindrical body, the sheathed piston 7 of the part that in piston rod assembly 9, diameter is less, and the part that diameter is larger forms moving piston bar.
Described moving piston bar external diameter and cylinder barrel 3 internal diameter meet relation 0.1 × π R
2< π (R
2-r
2) < 0.2 × π R
2, wherein R is cylinder barrel 3 internal diameter, and r is moving piston bar external diameter.
Stop when described upper end cap 4 is regained as oil cylinder, is connected by card key 2 and cylinder barrel 3, is fixed by upper end cap 4 with pressing plate 1; Described guide sleeve 11, as guiding during piston rod movement, its inner ring is provided with seal ring, and sealed by rod chamber a, guide sleeve 11 is fixed by lower end cap 13, stop when stretching out as oil cylinder, and lower end cap 13 inner ring is provided with dust ring; Described bulb 14, can be used for installing support chassis, makes oil cylinder while load-supporting, have certain angular adjustment, to adapt to irregular supporting surface.
The parameter of described dual-port support lock locking oil cylinder is implemented:
(1) diameter of piston rod r should be enough large, so that the back pressure unlocking oil pressure generation does not affect stretching out of oil cylinder, in order to ensure that unlocking oil pressure does not produce large back pressure to stretching out of oil cylinder, the useful area S of rod chamber a
h=π (R
2-r
2) should be enough little, if unblock oil pressure is p
h, then what produce stretches out back pressure for (S
h/ S
l) p
h, wherein the area of rodless cavity is S
l=π R
2, therefore should ensure π (R
2-r
2) < β × π R
2wherein β is the percentage that rod chamber a area accounts for rodless cavity area, the less then back pressure of β is less, and general desirable β=10% ~ 20% is advisable, and is not that β is the smaller the better, β is too small, then lock sleeve 8 and guide sleeve 11 excessive to extrusion stress during end at cylinder movement, cause the accurate inner circle of lock sleeve 8 or guide sleeve 11 deformation failure cylinder barrel 3, therefore, choosing of r meets following condition
and
wherein, Ft is the maximum thrust of oil cylinder, σ
e1for the smaller value of lock sleeve 8 or guide sleeve 11 elastic limit of materials, n
e1for lock sleeve 8 or guide sleeve 11 resiliently deformable safety coefficient, general desirable n
e1=2 ~ 4;
(2) cylinder barrel 3 wall thickness δ, the design of cylinder barrel 3 wall thickness is very important, and the magnitude of interference of it and interference fit has direct relation, and according to theory of elastic mechanics, the relation of magnitude of interference ε and wall thickness is as follows,
Wherein, E is the Young's modulus of cylinder barrel 3 material, and μ is the Poisson's ratio of cylinder barrel 3 material, can obtain following simplified design formula by above-mentioned relation
meanwhile, the design of cylinder barrel 3 wall thickness also needs satisfied following stress condition,
wherein, σ
e2for cylinder barrel 3 elastic limit of materials, n
e2for cylinder barrel 3 resiliently deformable safety coefficient, general desirable n
e2=2 ~ 4;
(3) lock sleeve 8 length L, the length of lock sleeve 8 is determined according to the size of coupling mechanism force, if required coupling mechanism force is F
s, then L=n
sf
s/ 2 π RLp
hf, wherein f is the friction factor of cylinder barrel 3 and lock sleeve 8, n
sfor locking safety coefficient, can determine according to reality of work situation.
Based on above-mentioned dual-port support lock locking oil cylinder, present invention also offers a kind of controlling method of dual-port support lock locking oil cylinder: the hydraulic system comprising above-mentioned dual-port support lock locking oil cylinder and be communicated with described cavity volume, when described dual-port support lock locking oil cylinder needs to unlock, the high pressure oil of described hydraulic system enters cavity volume from lower oil nozzle 10, and high pressure oil is by cylinder barrel 3 and the interference fit part of lock sleeve 8 and the bottom spreading of cylinder barrel 3.
See Fig. 3, wherein, described hydraulic system comprises high pressure oil pump 16 and low pressure fuel pump 17, the motion of oil cylinder is by two-way Oil-source control, high pressure oil pump 16 provides high pressure oil or the off-load of constant pressure under the control of the one or two solenoid directional control valve 15 and the first relief valve 18, when the one or two solenoid directional control valve 15 is in left position, high pressure oil off-load, oil cylinder is in locking state; When the one or two solenoid directional control valve 15 is in right position, high pressure oil injects lower oil nozzle 10, enter the rod chamber a of oil cylinder, spiral chute b is entered again from the lower end surface cylindrical of lock sleeve 8, because inside and outside piston 7, garden is all configured with seal ring, therefore the rod chamber a of oil cylinder and spiral chute b forms seal space, unlocks high pressure oil by cylinder barrel 3 and the interference fit part of lock sleeve 8 and the lower part spreading of cylinder barrel 3, thus realizes unlocking; Low pressure fuel pump 17 provides low pressure oil and injects oil nozzle 5 under the control of the two or two solenoid directional control valve 19 and the second relief valve 20, when three-position electromagnetic selector valve 22 is in left position, oil cylinder stretches out, when three-position electromagnetic selector valve 22 is in right position, oil cylinder is regained, now regulate withdrawal speed by throttle valve 21, when three-position electromagnetic selector valve 22 is at meta, oil cylinder stop motion.
The function of old unblock hydraulic fluid port c merges in motion control hydraulic fluid port by dual-port support lock locking oil cylinder of the present invention, thus only needs two oil nozzles, simplifies oil circuit, reduces cost, improve reliability; Simultaneously because unlock high pressure oil to enter rod chamber from lower oil nozzle, so only need a upper piston, enormously simplify internal structure, add effective travel.
See Fig. 4, dual-port support lock locking oil cylinder of the present invention unlock time, not only by cylinder barrel and lock sleeve interference fit part spreading, and by the rod chamber part also spreading of cylinder barrel, when making to unlock, the working state of cylinder barrel is better, abrasion, La Gou is less likely to occur, applies reliably convenient.
Claims (8)
1. a dual-port support lock locking oil cylinder, comprise cylinder barrel (3) and be fixed on the upper end cap (4) on cylinder barrel (3), lower end cap (13) and guide sleeve (11), described upper end cap (4), lower end cap (13), guide sleeve (11) and cylinder barrel (3) form a cavity volume, a piston rod assembly (9) is provided with in cavity volume, piston rod assembly (9) is arranged with a piston (7) and a lock sleeve (8) from top to bottom, lock sleeve (8) and cylinder barrel (3) interference fit, it is characterized in that: described cylinder barrel (3) upper end is provided with the upper oil nozzle (5) of a control cylinder action, cylinder barrel (3) lower end is provided with a control cylinder action and unlocks the lower oil nozzle (10) of oil cylinder.
2. dual-port support lock locking oil cylinder according to claim 1, it is characterized in that: also comprise locking nut (6), seal ring, described piston (7) is connected on piston rod assembly (9) by locking nut (6), and piston (7) inner periphery and the outer periphery are respectively equipped with seal ring and cavity volume is isolated into rod chamber (a) and rodless cavity; Described lock sleeve (8) periphery is provided with the spiral chute (b) be communicated with rod chamber (a).
3. dual-port support lock locking oil cylinder according to claim 1, it is characterized in that: described piston rod assembly (9) is up-thin-low-thick hollow stepped cylindrical body, the sheathed piston of part (7) that in piston rod assembly (9), diameter is less, the part that diameter is larger forms moving piston bar.
4. dual-port support lock locking oil cylinder according to claim 3, is characterized in that: described moving piston bar external diameter and cylinder barrel (3) internal diameter meet relation π (R
2-r
2) < 0.2 × π R
2, wherein R is cylinder barrel (3) internal diameter, and r is moving piston bar external diameter.
5. dual-port support lock locking oil cylinder according to claim 3, is characterized in that: described moving piston bar external diameter and cylinder barrel (3) internal diameter meet relation 0.1 × π R
2< π (R
2-r
2) < 0.2 × π R
2, wherein R is cylinder barrel (3) internal diameter, and r is moving piston bar external diameter.
6. a dual-port support lock locking oil cylinder controlling method, the hydraulic system comprising the dual-port support lock locking oil cylinder described in any one of claim 1 to 5 and be communicated with described cavity volume, it is characterized in that: when described dual-port support lock locking oil cylinder needs to unlock, the high pressure oil of described hydraulic system enters cavity volume from lower oil nozzle (10), and high pressure oil is by cylinder barrel (3) and the interference fit part of lock sleeve 8 and the bottom spreading of cylinder barrel (3).
7. dual-port support lock locking oil cylinder controlling method according to claim 6, is characterized in that: the motion of described dual-port support lock locking oil cylinder is by two-way Oil-source control.
8. the dual-port support lock locking oil cylinder controlling method according to any one of claim 6 or 7, described hydraulic system comprises high pressure oil pump (16) and low pressure fuel pump (17), it is characterized in that: described high pressure oil pump (16) under the control of the one or two solenoid directional control valve (15) and the first relief valve (18), provide high pressure oil and under injecting oil nozzle (10) to realize the unblock of dual-port support lock locking oil cylinder; Described low pressure fuel pump (17) provides low pressure oil and injects upper oil nozzle (5) under the control of the two or two solenoid directional control valve (19) and the second relief valve (20), described dual-port support lock locking oil cylinder stretches out when three-position electromagnetic selector valve (22) is in left position, regain when three-position electromagnetic selector valve (22) is in right position, and regulate withdrawal speed by throttle valve (21), the stop motion when three-position electromagnetic selector valve (22) is in meta.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172859.0A CN104214165B (en) | 2014-04-25 | 2014-04-25 | A kind of dual-port support lock locking oil cylinder and controlling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172859.0A CN104214165B (en) | 2014-04-25 | 2014-04-25 | A kind of dual-port support lock locking oil cylinder and controlling method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104214165A true CN104214165A (en) | 2014-12-17 |
| CN104214165B CN104214165B (en) | 2016-04-13 |
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|---|---|---|---|
| CN201410172859.0A Expired - Fee Related CN104214165B (en) | 2014-04-25 | 2014-04-25 | A kind of dual-port support lock locking oil cylinder and controlling method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105196243A (en) * | 2015-10-29 | 2015-12-30 | 芜湖恒隆汽车转向***有限公司 | Press-mounting and positioning method for steering cylinder |
| CN106979187A (en) * | 2017-04-26 | 2017-07-25 | 西安电子工程研究所 | A kind of hydraulic cylinder for being used to support |
| CN107401533A (en) * | 2017-08-08 | 2017-11-28 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack and its operation method |
| CN108916139A (en) * | 2018-06-15 | 2018-11-30 | 沪东中华造船(集团)有限公司 | A kind of fluid pressure type moulding bed support system and its application method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2653196Y (en) * | 2003-09-22 | 2004-11-03 | 武汉大学 | Mold closing composite oil cylinder for die casting machine |
| CN2727473Y (en) * | 2004-08-09 | 2005-09-21 | 中国航天科技集团公司第一研究院第十五研究所 | Interference locking hydraulic cylinder |
| US20080054239A1 (en) * | 2006-09-06 | 2008-03-06 | Hydro Leduc | Automatic-locking hydraulic jack |
| EP1995471A2 (en) * | 2007-05-25 | 2008-11-26 | Neumeister Hydraulik GmbH | Locking cylinder with fluid bearing |
| CN202451514U (en) * | 2012-01-12 | 2012-09-26 | 四川长江液压件有限责任公司 | Mechanical locking hydraulic cylinder |
-
2014
- 2014-04-25 CN CN201410172859.0A patent/CN104214165B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2653196Y (en) * | 2003-09-22 | 2004-11-03 | 武汉大学 | Mold closing composite oil cylinder for die casting machine |
| CN2727473Y (en) * | 2004-08-09 | 2005-09-21 | 中国航天科技集团公司第一研究院第十五研究所 | Interference locking hydraulic cylinder |
| US20080054239A1 (en) * | 2006-09-06 | 2008-03-06 | Hydro Leduc | Automatic-locking hydraulic jack |
| EP1995471A2 (en) * | 2007-05-25 | 2008-11-26 | Neumeister Hydraulik GmbH | Locking cylinder with fluid bearing |
| CN202451514U (en) * | 2012-01-12 | 2012-09-26 | 四川长江液压件有限责任公司 | Mechanical locking hydraulic cylinder |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105196243A (en) * | 2015-10-29 | 2015-12-30 | 芜湖恒隆汽车转向***有限公司 | Press-mounting and positioning method for steering cylinder |
| CN106979187A (en) * | 2017-04-26 | 2017-07-25 | 西安电子工程研究所 | A kind of hydraulic cylinder for being used to support |
| CN106979187B (en) * | 2017-04-26 | 2018-06-01 | 西安电子工程研究所 | A kind of hydraulic cylinder being used to support |
| CN107401533A (en) * | 2017-08-08 | 2017-11-28 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack and its operation method |
| CN108916139A (en) * | 2018-06-15 | 2018-11-30 | 沪东中华造船(集团)有限公司 | A kind of fluid pressure type moulding bed support system and its application method |
| CN108916139B (en) * | 2018-06-15 | 2020-08-07 | 沪东中华造船(集团)有限公司 | Hydraulic type jig frame supporting system and using method thereof |
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